Over the years I've had lots of marathon runners contact me asking for advice on their marathon fuelling, and asking is a great first step. Here's some quick suggestions and key points to help make the day go smoother, bear in mind everyone is different and what works for one, doesn't necessarily work for you. So keep trying different things in training until you settle on something that works for you.
This plan is aimed at a 3 to 5 hour road marathon runner, weighing around 75-80kg. (If you weigh more/less or a re planning on running faster/slower you can change that as needed.)
You are likely to be able to absorb no more than 250-350 calories per hour comfortably during endurance exercise.
The faster you run, less likely you are going to be able to chew / bite, I'd say if you were doing 2.45 marathon or faster, the flapjacks will have limited appeal during the race, as you'll be running too fast to be able to chew much.
A large Chia Charge flapjack is around 340-378 calories, so during the race, you could eat a maximum of1 per hour, but more likely a maximum 2 to 3 bars over 4 hours.
I would take 1 or 2 bars combined with other stuff, depends if you are carrying a bum bag, pockets etc. as to what you can carry.
Hopefully you have practised using your gear and carrying stuff in training.
I'd suggest you practise the following race fuelling strategy , but very importantly practise this every time you go for a long run during your training, This way you find out what works for you.
Evening before , good meal , pasta/rice or sweet potato base, I always eat chicken and vegetables now, rather than going for some massive pasta meal, that leaves me feeling bloated and potentially changing my normally routine bowel movements, and then making me anxious about where I'm going to "go" if you see what I mean.
7.30 eat flapjack or banana on way to race (not all at once)
9.00 Race starts - aim to have a bite of flapjack every half an hour, starting at 30 minutes, if this is just before a water station then thats great timing, doing London Marathon I would site a water station sign, have a bite, wash it down with some water.
Continue this every 20-30 minutes, flapjack bite+ fluid
Faster runners, will often use gels in that last hour.
I really want to emphasise 2 things
Everyone has individual tastes and preferences and our bodies that don't always conform to what the mind is telling them, so best to find out what suits your body?
Try the fuelling strategy out in your training, try and mimic in your weekend long runs, exactly what you plan to do in the race, this way, there wil be one less thing on the day for you to be anxious about, and you having done the training, considered your fuel and practised with your kit you will be starting the race with a much higher level of confidence and positive mental attitude.
Hope that helps? please shout up with any questions and good luck with your Marathon Adventure.